# Why do industries coagglomerate? How Marshallian externalities differ by industry and have evolved over time

> Research article (Journal of Urban Economics, 2018) · cited 197× · AI/ML

**Wikidata**: [openalex:W2807221122](https://www.wikidata.org/wiki/openalex:W2807221122)  
**Source**: https://4ort.xyz/entity/why-do-industries-coagglomerate-how-marshallian-externalities-differ-by-industry-and-have-evolved-over-time